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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4a75eb51826c712d695a605d8b909e467316cf61123061dccc6db137b1a5ebe' 
  AND token = 'bF8MwVkAA9mZzKka/NY3uUEl/MjL/Vnm0RlFlFnct4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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