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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76ae08604e731dea3823ff7c8670367f48df443f4b1e336dab1320abbf2b654' 
  AND token = 'Iz0qLab7PuzT1YAl8bxKhOR0p+rQbm+8NUu+CFaO8G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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