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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc8cdd3b7db65dafaa896ac46789463f4022be1fcf8b207c31efa00034e6bae6' 
  AND token = 'Bspkmd+xzpBHpENvuwE3fANhpaB5z+Xe2kgKV84moMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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