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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babf029e5e12a9082b6d90f0e0824458ba4b44cb36c01a8d4031a777c3152282' 
  AND token = 'MCqeXNeHtpJRVfiBxGwMgcBdxdjXvVnC7E9GbjR7E04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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