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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa137d5db4cf5fc7e5225342a6934b390ba4e21fb84ef87bdbc3c4a1790d364a' 
  AND token = 'kRkUkP9Jg1trKql7OYmGaAc1TZB9i5FEimlOiFwYM0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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