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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da7c82184458c4553d1d336468443b19063e76d16f3e064c153f7257626c75a' 
  AND token = '1d3QD/fOqiM5gfmWKDVLlqCktaH1HB6jcuU96szH0WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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