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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363c834f7c85a4b867417c1f0c935fbe3c2db644d86cd9654e64644edf78442c' 
  AND token = '66jOsh2vTBkXoI47cu7O8zpD0jHXvzLl2/371+HK1Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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