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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2530a228663907fed95b8cbb1eb69b7d48252fb444c88b1e9128b7fcfbd852' 
  AND token = 'tmG3Sr74oU+8coa+1jgg9jfrYjQXa6P/kz2Q2arx/Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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