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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61c1c4ff922749ce8f5d79dcbf0dfd6427032351349812f0df34ddeff5081e9' 
  AND token = 'E2BCv8JZoA7SedqRL+z8X593PmSZdgqBcVXxWowoqBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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