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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf87af87c8d14f2c60c1cae3a4b5ead24d0d1c201114666aeb07a0e45a2097d' 
  AND token = 'M/FUDfsGphWJ0CkLB7g18I0WWwYlGfg7j19iCLPkt3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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