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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd794a89c1b0bd4894677a756f4ebf61440d0934a7cad71ba0ccb48f28df433b1' 
  AND token = '+TnyOR0lx7eyp84swNcxIKyibPwmJqcQE0hqj+rOV0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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