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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e0e9c870c54f9cb325ac574b1ee323035c0b5e9a847d00112f97ba4027e3de' 
  AND token = 'Pq8m102aeFExH+UnWyCoW9k1x7RmWJEkm1RA0s0PQ+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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