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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798221e49091260ee0d6e657242a865ed8d739213ae23b9ac3dfd9451e8e1ab8' 
  AND token = 'j1y00+0EG+LQnQvo38u8nUjIRQxnb/Dy9YbpRku/FVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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