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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae989a8cec4a229186aabf263b9f699216f61a681423daeee4c078cf3759e36b' 
  AND token = 'kuhJIFiN+Iv4S9h4xwVb94eIP0er3FNKtK4JeYCHynA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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