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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9b89c75a8aef1bcde9743d648f12e5a3eb6e649fd2f6d4ede42b42c9d0b17f' 
  AND token = 'Y3jimStFp4NKgyQMxYrHSkbnDkRWhoOdmnFIFtn+8WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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