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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efea1716ff474e37fc6801203a13b689f8168301b597d7d4396973785f787685' 
  AND token = '+EC5zw+9L6F9tOUqey+invhJdPKPGEI6o23CnePKrIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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