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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0d4c465980cc55cc81d44a99bb6208d91ca409d5618c7b96b1a209b65e2a4a2' 
  AND token = '23Uj0sbSKTLxkciNODdKqTqvSgkfqvg5nAokPh5T9i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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