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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c5e36cd0924b1934f21cb5139df8ccfe39208d817bcdd7901bdaf5ee032037' 
  AND token = 'w6xtk2lj+Ad61dcczZF8u9OqJ21XUYVJIB+1uJYJI58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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