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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055a8c022a5bbec827ed581bb9ac68232ced887586c329a4ab10ea7aeba49879' 
  AND token = '1n4oUhvnKgHEXAR42eke1VVLdwjJxPngO4I/cocug1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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