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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a514eb5a924611d3c93f5362ee17a2a0c64369cf6b067efd6c7e44c3bcc426c' 
  AND token = '8NHWCzeoNql96bBHSlAPRniwn3fX1HEec2rSc+bzeE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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