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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13851ab25b56635f55dc7dc1d8ce26bcb71cbdd30e9ae1eb2c8d70f3c53ce92' 
  AND token = 'Rl+Dyw0ihWtPp64cQH86q4dfd/u7gsCak9jHvFiRy50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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