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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd52dc96a335d1c9680a4ed02d5e60bf0f2bc4f3d58634e994d5e6943e00e225d' 
  AND token = 'ojQXGSngL3TZTTGq4CxMOgDU8uD24tGcbqVetOYbsW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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