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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd942f9f4142373c631b81d2793f6babb762ee2a23b6b1cf555899830881cb4' 
  AND token = 'Io0Udn12/t3W1AyKefSaF9MgUnF8wHS3hmakTDVcU8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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