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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b1cc62ca7328d28d719c43572ef3a3c6941edcb711152ab21771f99cb9b0fb' 
  AND token = 'g9XWiboFD/lSHBmkCPoalzq/jt/rRt0DXo12Skgca1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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