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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e7ac35cd9eed0cc8db5a799200a6403dd45fc7b4b3051f9ab723fa82f7b6cd' 
  AND token = 'lilKXioqDDqgen6ZFA1oZGBdnPxhrzkbkAbh88/2ZqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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