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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd919b8e0fe6ee7429d9fbdabf9bbf57d8db2419f7b26e49627324a17f0d846' 
  AND token = '3jX/WqwcGQMpFztEvSr87IVe27j8kRavNM2+I2HtV1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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