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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee94386633cdb8de6a2caf4da6e6820fe8e74e82f5a18fc280e7e7b8ddef01c' 
  AND token = 'IIfDnhfgMAkB7vRvD90KHu7Pan5h5fJKMuqEm1EunPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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