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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb03e0f10349ae4850d3ee433eb036c41bb96e5be3081b09caf3c599573f284' 
  AND token = 'DBU2NKwKY/p7JcuvlbHBk1fljTgujwC7Yh4qUapUeqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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