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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb58b25ce0778c1c3f6b8320cc7d49ee0ed514824b7b4b845bb0427b41b55b78' 
  AND token = 'fe30CJ/YGx4AdpKeUd+lD2fbpGchyL6/dLkegSvViRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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