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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3146d4960ecec7a525d58ebe0496d84249f04e5e65a8b7b62cd15ce8975ec0' 
  AND token = 'vMkGC5cCG5LGTUDU48jBZDiZEJ1hFZogVyi7dqd52Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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