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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8992742344713653fc2dd3c0b19bd64761e59d046f80b16aef4146b18701a718' 
  AND token = 'z3R4KaFx1a97e7b4psPsu6IAI2UfdKdVVTueu/Z9N5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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