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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '475c305f22d2b5958cab17f3c23e11d26086da38d2310848c0b14d6f352bbad0' 
  AND token = 'goFXE2cN09zgUpjZ/y8YpuBItR2leaAQq6QOYVp9pvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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