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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8829653e2cdb46d8a38784e57ae86f9ef1aa1783416ce79a3bca881b882811d7' 
  AND token = 'nQDCVPzqg48Bb9Mg92dPGS33ifLD5e+IsuXtXypEoy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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