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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b1414e2768c807330ea5e9e084b59dc80dd5b79e88436fc2d4b6019a147c9ae' 
  AND token = 'jZBu6rk5E+4QbViUiDdpCP1pzlxhO5JH5+39SbseyxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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