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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d76e8c1818bd84fd918749d3dc863c56865e711e99db2956937dcedc16133e7' 
  AND token = 'VOA1S6v5067TREDrZoxJk0UVf8sMv/7vu6KytXtWCY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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