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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac56f93910a5a14fb80eda3b6ffb81ff27cf217d3757a7fce5653ca4d61606c' 
  AND token = '1E4eDhmNwh2cTy5lQ4h0iyVX5E99Rd819xpDyBYwMLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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