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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72de6f7a68cac7179f66d71ca38d5c1698a5a9ee7da400647d67219c69a7d2e9' 
  AND token = 'wB0Itb1Zyj7HPl5Evre/Yx6bj0a4Ep+jM4mW3mYEwEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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