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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c936d0df70d9b7a1a24c56dbd23c7dd054cb25931363c2588e2c52c24e0718' 
  AND token = '8GOkZUztfBMkvE9RA7WuNi31rNa/GdMjX8vDruPnjWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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