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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a549342aa1bb119d69419aa706b68896c7aa38d8329cb062d98615d8e15e7f15' 
  AND token = 'BFsnz8gGerXyGJB+yS/L8yLURmAFYV665DN4H03I6RM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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