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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e402dc2001fae3006c23894f7fa507a48e35bf20a394884e90311a4d2a313d2a' 
  AND token = 'uOpdDKkj4/DMyqI6X/qgHkw+KgaYr1Bktsssp85s5XA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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