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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ca356d7c40243cc61492882839d3973b05160869b2a2ebb4a71bcbcfb152d7' 
  AND token = 'm1eBr434Pr4cp+eJFlu9OFZ0G07D1Mc9KbjbkJON4Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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