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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6faed263b12c70d153f16c98a649047e5f5cb442a25d5149ea60bbced8844b' 
  AND token = 'K66+DV4MKorKuRI+y2knQKiWLmDAJFP9b08t9WGMUGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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