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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad03f78241ca19d08b5c9d70ab6d2e55c2fa073f897a97e99e1bd2ac84c150a8' 
  AND token = 'ogwQAspe7G2csu5tYKxK97X6HTpHKiTbP30KL4OZojc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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