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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f40a1fbb4e7ece205a0a8b7d26dcaf232d85c7bb63d6b554dd47115743177d' 
  AND token = 'mHPe4zSN1NX0sSAMBFYnu9P6Gsz86lT58uq4QpLweQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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