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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1ead10e7ddf59970afaeb4243cb857322f3957f4e851d86e6634a35ce2d8a9' 
  AND token = 'TN0yLn1HQY1s5QkYD94KaI1ut0b0toF+bA8zPHgmf4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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