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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fafab4df2a094051fd06516aa68cf38fd2dea9a24e79bdcd73a3b2ba24b0a17' 
  AND token = '9clBJ7uMlJkKUxyF/0BV8xarSLyt6pt28eQEmgk1MuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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