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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7666d33118e0fc4cd64bf41d0d7e15f60c74e3841d0fe7a1169fc37faf7fa58' 
  AND token = 'ignMJIa2owCPkcJ41gI/zSEKFWYPI/9xnIeogAPu5sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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