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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbda8673cc059c6a5a8910b07c1b907fe87eec957b735db0570316f1e95d8838' 
  AND token = '4zmjXMnJsq1oaA5vlldR5CkPIdCMZLjQhBcFdx0H5jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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