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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fe87c0ba5b1226b64eb97828964492c37c101518e7726ee27b979bed3bba78' 
  AND token = 'o1vfkZYH6uPzoO63cvuRedL58bwxDfwHQGA6yw7ixmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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