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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4120d1d409fe1545ff4dcf24036bbb560eef7d27345f0c388ad598e3223bafd9' 
  AND token = 'iK4i2lOokF+IpkvGu6eZ5zuQFSeab5uMFd/IehIlo8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}